title: Modified active disturbance rejection control for time-delay systems.
abstract: Industrial processes are typically nonlinear, time-varying and uncertain, to which active disturbance rejection control (ADRC) has been shown to be an effective solution. The control design becomes even more challenging in the presence of time delay. In this paper, a novel modification of ADRC is proposed so that good disturbance rejection is achieved while maintaining system stability. The proposed design is shown to be more effective than the standard ADRC design for time-delay systems and is also a unified solution for stable, critical stable and unstable systems with time delay. Simulation and test results show the effectiveness and practicality of the proposed design. Linear matrix inequality (LMI) based stability analysis is provided as well.
authors.affiliation: Center for Advanced Control Technologies, Fenn College of Engineering, Cleveland State University, Cleveland, OH 44115, United States. Electronic address: zhaos@frib.msu.edu.
authors.forename: Shen
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Center for Advanced Control Technologies, Fenn College of Engineering, Cleveland State University, Cleveland, OH 44115, United States.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Gao
keywords: Active disturbance rejection; Linear matrix inequality; Observer; Synchronization; Time delay